应用经常抛出如下异常，到底是什么原因造成的？
####<2009-1-6 ÏÂÎç01ʱ54·Ö50Ãë GMT+08:00> <Error> <HTTP> <yc_wls2> <webserver2> <[ACTIVE] ExecuteThread: '3' for queue: 'weblogic.ke
rnel.Default (self-tuning)'> <<WLS Kernel>> <> <> <1231221290382> <BEA-101020> <[weblogic.servlet.internal.WebAppServletContext@2ba1
2ba1 - appName: 'autoclaim', name: 'autoclaim', context-path: ''] Servlet failed with Exception
java.lang.NullPointerException
        at jsp_servlet.__error._jspService(__error.java:123)
        at weblogic.servlet.jsp.JspBase.service(JspBase.java:34)
        at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
        at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
        at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:283)
        at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
        at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
        at org.ecside.filter.ECSideFilter.doFilter(ECSideFilter.java:260)
        at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
        at weblogic.servlet.internal.RequestDispatcherImpl.invokeServlet(RequestDispatcherImpl.java:526)
        at weblogic.servlet.internal.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:261)
        at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1078)
        at org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:295)
        at org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:396)
        at org.apache.struts.tiles.TilesRequestProcessor.processForwardConfig(TilesRequestProcessor.java:347)
        at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:232)
        at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
        at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:743)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
        at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
        at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
        at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:283)
        at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
        at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
        at org.ecside.filter.ECSideFilter.doFilter(ECSideFilter.java:260)
        at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
        at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3229)
        at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
        at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
        at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2002)
        at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:1908)
        at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1362)
        at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
        at weblogic.work.ExecuteThread.run(ExecuteThread.java:181)

org.ecside.filter.ECSideFilter.doFilter(ECSideFilter.java:260)
哪位大侠说一下，这一行是什么内容？

这是你应用程序写的过滤器。。我现在也出现你这个问题，但不知道怎么解决！！